dumb as a box of rocks

English

Etymology

Variation of dumb as a rock.

Pronunciation

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Adjective

(as) dumb as a box of rocks

1. (simile, slang) Very stupid.
   • 2001 July, “Tell it to my Heart”, in CMJ New Music Monthly, →ISSN, page 29:

     The drummer in my friend's band is pretty hot, but he's dumb as a box of rocks. I hear he likes me, and I definitely don't want to date him—but is his stupidity any reason not to simply have sex with him? — Carla, Brooklyn, New York